[PATCH 1/2] zhashfs, detect fill pattern and suppress blocks in output
dsd at laptop.org
Mon Apr 25 15:44:13 EDT 2011
On 21 April 2011 05:46, James Cameron <quozl at laptop.org> wrote:
> Allows the unused filesystem blocks of the image to be left out of the
> .zd file, resulting in a factor of two reduction in fs-update times on
> a typical build on a 4GB microSD. Greater reduction occurs on larger
> microSD or SD cards.
> Has no effect if a fill pattern file is not found.
A more correct option would be to use the FIEMAP ioctl to detect the
gaps in the file and determine the unused blocks that way. Have you
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